>Ashley Wright wrote:
>> The older trains use a resistor bank to provide a varying current or
>> voltage (not sure which) to allow the train to accelarate.
Motors in series, resistor banks to start, then cut out the resistors,
(motors in series), switch combinations to series-parallel, switch again
to full parallel, then switch reistors into the motor fields 'weakfields'
(More speed, but less power). The end result of all the switching is
varing voltages and currents applied to the motors, with out overly complex
electronics.
>I think the V sets use 415V not sure about the others.
Motor-generator sets, to generate a since 'industrial' 3 phase supply for
the air-conditioning. Other low voltage auxillary equipment is possibly
also supplied from farly conventional 415/240v powersupplies.
>--
>Bye for now,
>Eben.
>http://www.klever.net.au/~ebenlevy/